CN114720667A - Paint covering property experimental method - Google Patents
Paint covering property experimental method Download PDFInfo
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- CN114720667A CN114720667A CN202111565901.1A CN202111565901A CN114720667A CN 114720667 A CN114720667 A CN 114720667A CN 202111565901 A CN202111565901 A CN 202111565901A CN 114720667 A CN114720667 A CN 114720667A
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- 239000003973 paint Substances 0.000 title claims abstract description 63
- 238000002474 experimental method Methods 0.000 title claims description 19
- 238000012360 testing method Methods 0.000 claims abstract description 171
- 238000000576 coating method Methods 0.000 claims abstract description 134
- 230000000873 masking effect Effects 0.000 claims abstract description 133
- 239000011248 coating agent Substances 0.000 claims abstract description 113
- 238000011156 evaluation Methods 0.000 claims abstract description 29
- 238000010998 test method Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000011417 postcuring Methods 0.000 claims description 7
- 230000007717 exclusion Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 description 13
- 239000000758 substrate Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 239000005028 tinplate Substances 0.000 description 7
- 238000010422 painting Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000001792 White test Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012854 evaluation process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/8422—Investigating thin films, e.g. matrix isolation method
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/32—Paints; Inks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0616—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
- G01B5/066—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/8422—Investigating thin films, e.g. matrix isolation method
- G01N2021/8427—Coatings
- G01N2021/8433—Comparing coated/uncoated parts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
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Abstract
Provided is a paint hiding property test method capable of improving evaluation precision. The paint hiding test method is a paint hiding test method using a plurality of black and white hiding test members having black and white patterns, and comprises the following steps: a step coating step of applying a paint by changing the number of times of coating so that the target film thickness values are different in a stepwise manner for each of a plurality of black-and-white masking test members to which the paint is not applied; a curing step of curing the paint applied to the plurality of black-and-white masking test members; and an evaluation step of evaluating the black-and-white hiding property of the paint by comparing the plurality of black-and-white hiding test members obtained through the curing step with each other.
Description
Technical Field
The present disclosure relates to a hiding test method of a paint.
Background
Conventionally, "black-and-white hiding film thickness value" has been known as an index indicating the base hiding property, which is one of the characteristics possessed by a paint. The larger the black-and-white hiding film thickness value is, the lower the substrate hiding property is, and the smaller the black-and-white hiding film thickness value is, the higher the substrate hiding property is. As a method for obtaining the thickness value of the black-and-white mask film, for example, as described in patent document 1, a method based on a mask rate test method defined in JIS-K5600-4-1 using a black-and-white mask test member having a black-and-white checkered pattern is known.
The method described in patent document 1 is as follows. In this method, a black-and-white masking test paper was attached to the center of the tin plate in the left-right direction by a double-sided tape to obtain a black-and-white masking test member. The black and white masking test paper was formed into 6 areas from the top to the bottom, and the outside of the upper 1 area was covered with a masking plate so as not to be stained with the paint, and the paint was sprayed in a predetermined dry film thickness. Next, the masking plate covering the black-and-white masking test member was moved to the next area below the black-and-white masking test paper, and then the first area and the newly appearing area were uniformly coated. That is, the region that is exposed at the beginning is repeatedly coated, and the film thickness thereof becomes thicker than the newly appearing region. The above operation was repeated, and all 6 areas were coated by 1-time movement of one area.
Then, drying was performed, and the obtained black-and-white masking test member was visually observed under an artificial sun lamp. The thickness of the film in 1 region where the thickness was thicker than the region where the black-and-white boundary of the black-and-white masking test paper slightly penetrated was measured as a black-and-white masking film thickness value, as observed in the order of thickness of the applied film from thick to thin.
Patent document 1: japanese laid-open patent publication No. 2010-241911
Disclosure of Invention
However, in the method of patent document 1, since the coating is sequentially repeated on the surface having the level difference generated by coating one test paper by moving one area 1 time, it is difficult to perform the coating uniformly and accurately and to perform the quality evaluation with high accuracy. The recent high-hiding paint requires little film thickness difference to be formed during evaluation, and therefore the above-mentioned problem becomes remarkable.
The present disclosure can be achieved in the following manner.
(1) According to one aspect of the present disclosure, a method for testing the hiding properties of a coating is provided. The paint hiding test method is a paint hiding test method using a plurality of black and white hiding test members having black and white patterns, and comprises the following steps: a step coating step of applying the paint by changing the number of times of coating so that the target film thickness values are different in a stepwise manner for each of the plurality of black-and-white masking test members to which the paint is not applied; a curing step of curing the paint applied to the plurality of black-and-white masking test members; and an evaluation step of evaluating the black-and-white hiding property of the paint by comparing the plurality of black-and-white hiding test members obtained through the curing step with each other.
According to the paint hiding test method of the above aspect, in the stepwise coating process, the paint is applied by changing the number of times of coating in steps so as to obtain different target film thickness values in steps for a plurality of black-and-white hiding test members to which the paint is not applied. Therefore, compared with a method of forming a coating film having a stepwise difference in film thickness on a single surface of a piece of test paper, the coating accuracy is stable, and the evaluation accuracy can be improved.
(2) In the above aspect, the step coating process may include: a uniform coating step of coating the black-and-white masking test member, which is one of the plurality of black-and-white masking test members before the curing step and has a thickness of the paint that does not reach a value corresponding to the target film thickness value before the curing step, with a uniform thickness; and an excluding step of excluding the black-and-white masking test member, whose pre-curing film thickness value has reached a value corresponding to the target film thickness value, from a target of the next uniform coating step, and repeating the uniform coating step and the excluding step until the pre-curing film thickness values of all the black-and-white masking test members except the black-and-white masking test member excluded from the target in the excluding step reach a value corresponding to the target film thickness value.
According to the method for testing the hiding properties of a coating material of the above-described aspect, by repeating the uniform coating and removing steps in the step-coating step, it is possible to sequentially produce black-and-white hiding test members in which the pre-curing film thickness value has reached a value corresponding to the target film thickness value, from members having a small target film thickness value.
(3) In the above aspect, the evaluation step may include: comparing two black-and-white masking test members of the plurality of black-and-white masking test members after the curing step is performed, the two black-and-white masking test members having the target film thickness values of adjacent steps, and determining a black-and-white masking test member in which a boundary between a white portion and a black portion in the black-and-white pattern is not observed; a film thickness value acquiring step of acquiring a cured film thickness value, which is the thickness of the paint in the black-and-white masking test member having the determined critical value; and a step of determining the obtained cured film thickness value as a black-and-white hiding film thickness value which is an evaluation value of the black-and-white hiding property.
According to this aspect, a critical black-and-white masking test member in which the boundary between the white portion and the black portion in the black-and-white pattern cannot be observed is specified, and the post-curing film thickness value of the specified black-and-white masking test member is defined as the black-and-white masking film thickness value. Therefore, the black-and-white hiding property of the paint can be evaluated accurately by numerical values.
(4) In the above aspect, the step coating process may include: a uniform coating step of coating the black-and-white masking test member, which is one of the plurality of black-and-white masking test members before the curing step and has a thickness of the paint that does not reach a value corresponding to the target film thickness value before the curing step, with a uniform thickness; a film thickness measuring step of measuring the pre-curing film thickness value in the black-and-white masking test member after the uniform coating step is performed; and an excluding step of comparing the measured pre-curing film thickness value with a value corresponding to the target film thickness value, excluding the black-and-white masking test member, whose pre-curing film thickness value has reached the value corresponding to the target film thickness value, from a target of the next uniform coating step, and repeating the uniform coating step, the film thickness measuring step, and the excluding step until the pre-curing film thickness values of all the black-and-white masking test members other than the black-and-white masking test member excluded from the target in the excluding step reach the value corresponding to the target film thickness value, the film thickness value acquiring step including the steps of: the post-curing film thickness value is calculated by multiplying the pre-curing film thickness value measured in the film thickness measuring step by the residual heating amount determined in advance through experiments, which is the ratio of the solid content remaining as a coating film after baking the coating material.
According to this aspect, even when the target film thickness value differs due to a coating failure in the step coating process, it can be known before the curing process, and the process can be restarted immediately.
(5) In the above aspect, the target film thickness values may be different from each other in the black-and-white shading test unit in a stepwise manner at equal intervals. According to this aspect, the target film thickness values of the plurality of black-and-white masking test members are different stepwise at equal intervals. That is, a black-and-white shading test member having a constant film thickness step and coating films having different shades at the same intervals can be produced. Since the black-and-white shading test member in which the black and white shading is continuous in the order of the thickness of the coating film does not change rapidly, the critical black-and-white shading test member in which the black-and-white pattern cannot be observed can be easily determined in the evaluation step, and the evaluation accuracy can be improved.
Drawings
Fig. 1 is a main flow chart illustrating a hiding test method of a paint in a first embodiment of the present disclosure.
Fig. 2 is a flowchart illustrating the step coating process.
Fig. 3 is a schematic diagram for explaining the arrangement process.
Fig. 4 is a schematic diagram for explaining the step coating process.
Fig. 5 is a schematic diagram for explaining the step coating process.
Fig. 6 is a schematic diagram for explaining the evaluation step.
Fig. 7 is a main flow chart illustrating a hiding test method of a paint in the second embodiment of the present disclosure.
Fig. 8 is a flowchart illustrating the step coating process.
Detailed Description
A. The first embodiment:
referring to fig. 1 to 6, a hiding test method of a paint in a first embodiment of the present disclosure is explained. As an index indicating the base hiding property, which is one of the characteristics of the paint, "black and white hiding film thickness value". In the hiding test method according to the present embodiment, a black-and-white hiding film thickness value is obtained for a paint to be tested, and it is evaluated whether or not the obtained black-and-white hiding film thickness value matches a black-and-white hiding film thickness value defined based on predetermined conditions for the paint. In determining the black-and-white mask film thickness values, a plurality of black-and-white mask test units were used.
Fig. 1 is a main flow chart illustrating a hiding test method of a paint in a first embodiment of the present disclosure. Fig. 2 is a flowchart illustrating the step coating process. Fig. 3 to 6 are schematic views for explaining respective steps of the experimental method for the hiding property of the paint.
First, black-and-white masking test members 11, 12, 13, 14, and 15 used in the masking test method will be described. As shown in fig. 3 to 6, the plural (5 in the present embodiment) black-and-white cover test members 11, 12, 13, 14, and 15 used in the cover test method of the present embodiment have the same configuration. In each of fig. 3 to 6, only the first black-and-white masking test member 11 or the second black-and-white masking test member 12 is given a reference numeral for the constituent elements of the black-and-white masking test members 11, 12, 13, 14, and 15 described in detail below, and the reference numerals are omitted for the constituent elements of the other black-and-white masking test members 13 to 15.
As shown in fig. 3, each of the black-and-white masking test members 11, 12, 13, 14, and 15 includes a tin plate 16 and black-and-white masking test paper 17. The tin plate 16 has a rectangular shape in plan view, and the long side is arranged to coincide with the vertical direction. The width of the tin plate 16 is substantially the same as the width of the black-and-white masking test paper 17. Black and white masking test paper 17 is printed with black and white checkered patterns as black and white patterns.
In the black-and-white masking test paper 17 of the present embodiment, white block portions 18 and black block portions 19 each having a square shape are alternately arranged so as to form 2 × 2 blocks as a whole. One side of each block 18, 19 is approximately 50mm in length. The brightness in the white block portion 18 is equal to or higher than the L value 90, and the brightness in the black block portion is equal to or lower than the L value 12. The white block portion 18 corresponds to a "white portion", and the black block portion 19 corresponds to a "black portion". The black-and-white masking test paper 17 is attached to the center of the tin plate 16 in the vertical direction. Upper and lower end portions of the tin plate 16 are formed with upper and lower spaces 21 and 22 to which the black-and-white masking test paper 17 is not attached.
Next, a method of a hiding test of paint using the black-and-white hiding test members 11, 12, 13, 14, and 15 described above will be described. In the present embodiment, the coating material to be evaluated has a black-and-white hiding film thickness value of 1.0. + -. 0.2. mu.m. That is, the standard median was 1.0 μm, the allowable lower limit was 0.8 μm, and the allowable upper limit was 1.2 μm.
As shown in fig. 1, the masking test method includes a film thickness determining step S10, a disposing step S20, a step coating step S30, a curing step S40, and an evaluating step S50. In the film thickness determining step S10, target film thickness values that differ stepwise at equal intervals are determined for each of the plurality of black-and-white masking test pieces 11, 12, 13, 14, and 15. In the present embodiment, the standard of the black-and-white mask film thickness values is 1.0 ± 0.2 μm, and therefore, the target film thickness values of the black-and-white mask experimental units 11, 12, 13, 14, and 15 are set in increments of 0.2 μm. The difference in the target film thickness values of the black-and-white shading test pieces 11, 12, 13, 14, and 15, that is, the thickness 0.2 μm, is a so-called "film thickness step".
The target film thickness of the first black/white masking test part 11 was set to 0.6 μm, which is a film thickness step amount lower than the allowable lower limit value. The target film thickness of the second black-and-white masking test unit 12 was set to 0.8 μm, which is the allowable lower limit value. The target film thickness value of the third black-and-white shading test member 13 was set to 1.0 μm of the median value. The target film thickness of the fourth black-and-white masking test unit 14 was set to 1.2 μm, which is an allowable upper limit value. The target film thickness of the fifth monochrome mask test device 15 is set to 1.4 μm which is higher than the allowable upper limit by the film thickness step amount.
Fig. 3 is a schematic diagram illustrating the arrangement step S20, and is a diagram of the state where the arrangement of all the black-and-white masking test pieces 11, 12, 13, 14, and 15 is completed when viewed from the front. In the disposing step S20, as shown in fig. 3, the plurality of black-and-white masking test pieces 11, 12, 13, 14, and 15 are disposed on the flat substrate 23 such that the coating surfaces are on the same plane. The substrate 23 is a steel plate made of tin or the like, and is fixed to a not-shown mount by a magnet. Five black-and-white masking test members 11, 12, 13, 14, and 15 are arranged laterally at substantially equal intervals in order from one side (left side in fig. 3) on a substrate 23.
Fig. 2 is a flowchart illustrating the step coating process S30. In the stepwise coating step S30, the number of times of coating is changed stepwise for each of the plurality of black-and-white shading test members 11, 12, 13, 14, and 15 to which no paint is applied. Thus, the thickness of the coating film was formed in different film thickness steps in steps at equal intervals in the black-and-white masking test members 11, 12, 13, 14, and 15.
As shown in fig. 2, the step coating step S30 includes a uniform coating step S31, a film thickness value acquisition step S32, and an elimination step S33. As described later, in the present embodiment, the uniform coating step S31 is executed a plurality of times (7 times in the present embodiment). In the uniform coating step S31, the black-and-white masking test members 11, 12, 13, 14, and 15, in which the thickness of the coating film of the black-and-white masking test members 11, 12, 13, 14, and 15 before the curing step, that is, the pre-curing film thickness value does not reach the target film thickness value converted before curing, were coated to a uniform thickness as the coating target. "uniform" has a broad meaning including not only states having no errors at all from each other but also states having errors of less than 5%.
The "target film thickness value" refers to the thickness value of the coating material after the curing step S40 described later. The "target film thickness value converted before curing" is a thickness value of the coating material before curing, which is estimated to be the target film thickness value after the curing step S40. Hereinafter, when the "pre-curing film thickness value" and the "target film thickness value" of the black-and-white masking test member are compared, the "target film thickness value" means a "target film thickness value converted before curing".
In addition, if the "target film thickness value" is considered as a value before curing, the "value corresponding to the target film thickness value" is the "target film thickness value itself", and if the "target film thickness value" is considered as a value after curing, the "value corresponding to the target film thickness value" is the "film thickness value before curing converted by dividing the target film thickness value by the heating residual amount". Here, the "value corresponding to the target film thickness value" should be interpreted not to be limited to the complete agreement of the numerical values of the "pre-curing film thickness value" and the "target film thickness value" in a strict sense, but to be a corresponding value as long as the agreement is within a range that is generally judged to be in agreement according to the technical common knowledge in the technical field.
Fig. 4 is a schematic diagram illustrating the uniform coating step S31, and shows a case where all 5 black-and-white masking test members 11, 12, 13, 14, and 15 are coated. The uniform coating was manually applied using a known spray gun. The air pressure of the spray gun, the discharge amount, and the pattern width (the longitudinal width of the elliptical shape of the paint formed by spraying the paint) were set to predetermined values so that the thickness of the paint obtained by one-time spraying was 0.2 μm. The value of 0.2 μm referred to herein is the film thickness after curing. In the case of spraying, the film thickness value at the time of coating, that is, the film thickness value before curing is set in consideration of the residual heating amount of the coating. For example, when the paint of the present embodiment has a residual heating amount of 3.5%, the film thickness of the coating film having a post-curing film thickness value of 0.2 μm is about 6 μm before curing. The heating residual amount is a ratio of a solid component remaining as a coating film after baking the coating material, and is determined in advance by experiments.
In fig. 4, the coating routes R1, R2, R3 by the spray gun are indicated by broken line arrows. As shown in the coating routes R1, R2, and R3, in the present embodiment, the entire surface of each of the black-and-white masking test pieces 11, 12, 13, 14, and 15 was coated in three parts, i.e., an upper route R1, an intermediate route R2, and a lower route R3. More specifically, as shown in the upper route R1, the operator cocks the spray gun with the upper space 21 of the first black-and-white masking test member 11 as the target position, slides the spray gun laterally toward the second black-and-white masking test member 12, and sequentially cocks and paints the upper portions of the black-and-white masking test members 12, 13, 14, and 15. In this process, the upper part of each black and white masking test piece 11, 12, 13, 14, 15, i.e., mainly the upper empty space 21 and the upper section of the checkered pattern, was painted.
When the coating is completed up to the upper part of the fifth black-and-white masking test member 15, the target position of the spray gun is shifted downward by about one block. Then, as shown by the intermediate route R2, the spray gun was moved from the fifth black and white masking test piece 15 to the first black and white masking test piece 11 side while spraying was performed. In this process, the middle portions of the black and white masking test members 11, 12, 13, 14, and 15, i.e., the upper and lower sections, which are mainly checkered patterns, were coated.
Finally, the target position of the spray gun was shifted further downward by about one block, and the lower space 22 of the first black-and-white masking test piece 11 was set as the target position for firing. Then, as in the case of the painting of the upper route R1, the paint was slid in the lateral direction toward the second black-and-white masking test member 12 side as shown in the lower route R3, and was sequentially painted until reaching the empty space 22 of the fifth black-and-white masking test member 15. In this process, the lower part of each black and white masking test piece 11, 12, 13, 14, 15, that is, the lower section mainly having a checkered pattern and the empty space 22 were coated. The pattern width is applied so as to overlap each other. Furthermore, the spray gun is always directed in the vertical direction towards the coating surface. According to the above, all the black and white masking test members 11, 12, 13, 14, 15 as the coating objects were uniformly coated.
The reason why the three coating lines R1, R2, and R3 at different positions in the height direction are provided in this manner is that the spray gun has a characteristic that the amount of paint sprayed at the end portion of the spray area is smaller than that at the center portion, and in order to suppress the occurrence of variation in film thickness of the white block portion 18 and the black block portion 19 due to this characteristic.
Reference is again made to fig. 2. The film thickness value acquisition step S32, which is executed after the uniform coating step S31, includes a film thickness measurement step of measuring the pre-curing film thickness values of the black-and-white shading test members 11, 12, 13, 14, and 15. In the film thickness measuring step, the thickness of the coating film before firing is measured by, for example, a rotary wet film thickness gauge. At this time, the film thickness before curing is measured in the upper space 21 or the lower space 22 so that no measurement mark remains in the black-and-white pattern. After the primary uniform coating step S31, the post-curing film thickness strain was 0.2 μm (the pre-curing film thickness was 6 μm), and it was confirmed from the measurement value of the wet film thickness gauge whether the film thickness was correct.
At this time, if the thickness of the coating film is significantly different from the target film thickness value, the coating is performed again. For example, when the thickness of the coating film is smaller than the target film thickness, the coating film may be recoated again, and when the thickness of the coating film is larger than the target film thickness, the coating film may be wiped clean and then the uniform coating step S31 may be performed again. The film thickness value after curing, which is necessary for the subsequent evaluation, is calculated by multiplying the measurement value of a wet film thickness meter indicating the film thickness value before curing by the heating residual amount predetermined depending on the paint.
In the exclusion step S33 executed after the film thickness value acquisition step S32, the black-and-white shading test members 11, 12, 13, 14, and 15 whose film thickness value before curing becomes the target film thickness value converted before curing are excluded from the objects of the next coating step. Specifically, the black-and-white shading test pieces 11, 12, 13, 14, and 15 having the coating films with the target film thickness values were removed from the substrate 23. However, as described above, the lowest target film thickness value determined according to the standard of the black-and-white mask film thickness is 0.6 μm, and the coating films of any of the black-and-white mask test pieces 11, 12, 13, 14, and 15 do not reach the target film thickness value because only the coating film is coated by the amount corresponding to 0.2 μm in the first round of the routine shown in fig. 2. Therefore, in the first round, there were no black and white masking test pieces 11, 12, 13, 14, 15 to be removed.
After the removal step S33 is completed, it is determined whether or not all of the black-and-white masking test pieces 11, 12, 13, 14, and 15 have reached the respective target film thickness values (step S34). When it is determined that not all of the black-and-white masking test pieces 11, 12, 13, 14, and 15 have reached the respective target film thickness values, in other words, when it is determined that the film thickness of one or more black-and-white masking test pieces has not reached the target film thickness value (no in step S34), the process returns to step S31, and steps S31 to S34 are executed again. On the other hand, when it is determined that all of the black-and-white masking test pieces 11, 12, 13, 14, and 15 have reached the respective target film thickness values (yes in step S34), the step coating step S30 is terminated. In the present embodiment, the step S34 is realized by determining whether or not the film thickness acquired in the step S32 matches the target film thickness value.
After the first round of the elimination step S33, since the coating films of any of the black-and-white masking test pieces 11, 12, 13, 14, and 15 did not reach the target film thickness value (S34: no), the second uniform coating step S31 was performed again. If the recoating is not performed due to the variation in the measured values, the coating films of all the black-and-white shading test pieces 11, 12, 13, 14, and 15 become the target film thickness value (0.6 μm) set in the first black-and-white shading test piece 11 in the third round of the routine shown in fig. 2. Therefore, if the actual film thickness acquired in the film thickness value acquisition step S32 matches the target film thickness value, the first black-and-white masking test piece 11 is removed from the substrate 23.
In the fourth round of the uniform coating process S31, the black-and-white masking test members (the second black-and-white masking test member 12 to the fifth black-and-white masking test member 15) were coated with the first black-and-white masking test member 11 as the coating target. Fig. 5 shows a case where the first black-and-white masking test member 11 was removed from the substrate 23 and excluded from the painting target, and then the second to fifth black-and-white masking test members 12 to 15 were subjected to the fourth uniform painting as the painting target. The routes R1, R2, and R3 of the spray gun were the same as those of the first round, except that the coating objects were the second to fifth black-and-white masking test members 12 to 15.
As described above, the uniform coating step S31, the film thickness value acquisition step S32, and the removal step S33 were performed a plurality of times (7 times in the present embodiment) until the coating films of all the black-and-white masking test pieces 11, 12, 13, 14, and 15 had the respective target film thickness values. That is, for the number of times of going through the uniform coating process S31, the first black-and-white masking test member 11 was 3 times, the second black-and-white masking test member 12 was 4 times, the third black-and-white masking test member 13 was 5 times, the fourth black-and-white masking test member 14 was 6 times, and the fifth black-and-white masking test member 15 was 7 times.
Reference is again made to fig. 1. In the curing step S40, which is performed after the step coating step S30 is completed, the paint of the black-and-white masking test members 11, 12, 13, 14, and 15 is baked and cured. Specifically, the mixture was set at room temperature for 10 minutes, preheated at 80 ℃ for 10 minutes, and dried at 110 ℃ for 15 minutes.
Next, in the evaluation step S50, the obtained black-and-white shading test pieces 11, 12, 13, 14, and 15 were evaluated. In the evaluation step S50, the black-and-white hiding test pieces 11, 12, 13, 14, and 15 obtained in the curing step S40 were compared with each other to evaluate the black-and-white hiding property of the paint. More specifically, the description will be given. In the evaluation step S50, the plurality of black-and-white shading test pieces 11, 12, 13, 14, and 15 having different film thicknesses in a stepwise manner are compared in the order of thickness, and two black-and-white shading test pieces having adjacent steps as target film thickness values are compared with each other, thereby specifying a critical black-and-white shading test piece in which the boundary between the white block portion 18 and the black block portion 19 of the black-and-white pattern cannot be observed. Then, the determined film thickness value after curing of the black-and-white shading test member was used as the evaluation result. Specifically, the observation is performed at a temperature of 23 + -2 deg.C, a humidity of 50 + -5% RH, and a brightness of 2000-4000 lux of a standard light source device, and at a distance of 250-300 mm at an angle of 45 degrees with respect to the front surface. The "comparison in thickness order" may be observed from the first black-and-white shading test unit 11 having a small target film thickness value, or may be observed from the fifth black-and-white shading test unit 15 having a large target film thickness value.
Fig. 6 is a schematic diagram for explaining the evaluation step S50. As indicated by the dotted line in fig. 6, the set of the second black-and-white masking test member 12 in which the black-and-white pattern was observed while being transmitted and the set of the third black-and-white masking test member 13 in which the black-and-white pattern was not observed while being transmitted were selected. The film thickness after curing of the black-and-white hiding test piece 13 in which no black-and-white pattern was observed in this group was used as the evaluation result. That is, in the present embodiment, the third black-and-white masking test member 13 is a critical test paper in which the boundary between the white block portion 18 and the black block portion 19 cannot be observed. Therefore, the cured film thickness value of the third black-and-white masking test member 13 was 1.0 μm, which was the "black-and-white masking film thickness value" as the evaluation value of black-and-white masking property. As a result, the black-and-white mask film thickness value is within the standard, and it can be determined that the paint is a paint that meets the standard. The detailed environmental conditions in the curing step S40 and the evaluation step S50 may be appropriately changed according to predetermined conditions set in advance.
(1) As comparative examples, for example, there are the following prior art methods: a black-and-white test paper is divided into a plurality of regions, and the coating is repeated for each region by removing the masking plate, and a film thickness step is formed by sequentially forming a region from a thick coating film region to a thin coating film region. In contrast to this comparative example, according to the hiding test method of the first embodiment, the uniform coating process S31 and the removal process S33 are repeated in the step coating process S30, and the entire flat coating surface is uniformly coated in the uniform coating process S31. That is, since the coating step surface is not required, the coating accuracy is stable, and the evaluation accuracy can be improved.
(2) In addition, in the above-described conventional method, it is technically difficult to form a very small film thickness step of about 0.2 μm in each of the black-and-white masking test pieces 11, 12, 13, 14, and 15, but the method of the first embodiment makes it possible to evaluate a high-hiding paint having a black-and-white masking film thickness value of about 1.0 μm and 1.4 μm (substantially 2.0 μm or less).
(3) In the hiding test method of the first embodiment, the film thickness value obtaining step S32 is performed before the curing step S40, and the film thickness before curing is measured by a wet film thickness gauge. Therefore, even when the coating is defective and the measured value is significantly different from the target film thickness value in the step coating step S30, this problem can be recognized before the curing step S40, and the step can be immediately restarted. That is, the work efficiency can be improved.
(4) In the hiding test method of the first embodiment, the film thickness step is constant at 0.2 μm. That is, the black-and-white shading test pieces 11, 12, 13, 14, and 15 having coating films with constant film thickness steps and different shades at the same intervals can be manufactured. Since the shade does not change rapidly in the black-and-white shading test members 11, 12, 13, 14, 15 that are continuous in the order of the coating film thickness, the critical black-and-white shading test member in which the black-and-white pattern cannot be observed is easily determined in the evaluation step S50, and the evaluation accuracy can be improved.
B. Second embodiment:
next, referring to fig. 7 and 8, a method of a coating material hiding test in a second embodiment of the present disclosure will be described. Fig. 7 is a main flow chart illustrating a hiding test method of a paint in the second embodiment of the present disclosure. Fig. 8 is a flowchart illustrating the step coating process. The black-and-white masking test members 11, 12, 13, 14, and 15 used in the second embodiment are the same as those used in the first embodiment. In the second embodiment, it differs from the first embodiment mainly in the following points: the film thickness was measured after curing without measuring the film thickness before curing by a wet film thickness gauge. The description of the same steps as those in the first embodiment is omitted, and only the different portions will be described. In fig. 7 and 8, the same steps as those of the first embodiment are denoted by the same reference numerals.
As shown in fig. 7, after the curing step S40, a film thickness value acquisition step S320 is performed. In the film thickness value acquisition step S320, the post-curing film thicknesses of the respective black and white shading test pieces 11, 12, 13, 14, and 15 were measured by an electromagnetic film thickness meter. In contrast, in the step coating step S300 shown in fig. 8, after the uniform coating step S31, the film thickness value obtaining step S32 (see fig. 2) is not performed, and the eliminating step S33 is performed. In the second embodiment, the black-and-white masking test pieces 11, 12, 13, 14, and 15 whose film thickness value before curing becomes the target film thickness value in the eliminating step S33 are determined by the number of times of coating. In S34, the same applies to the case of determining whether or not the pre-curing film thickness values of all the black-and-white shading test pieces 11, 12, 13, 14, and 15 have become the target film thickness values.
According to the second embodiment, the same effects as the effects (1), (2), and (4) described above in the first embodiment can be obtained.
C. Other embodiments are as follows:
(C1) in the black-and-white masking test pieces 11, 12, 13, 14, and 15 according to the above embodiments, the size of one square of the black-and-white checkered pattern is about 50mm, but it is sufficient if it is about 40 to 80mm, and this value can be easily visually confirmed in the evaluation step S50 and can be changed as appropriate. In addition, the number of checkered patterns is two stages of 2 blocks × 2 blocks in the above embodiments, but may be one stage of 2 blocks. Further, as long as the black-and-white pattern can be evaluated by discriminating the boundary between black and white, the pattern shape, brightness, other conditions, and the like can be appropriately changed.
(C2) In the first embodiment, the film thickness value before curing is multiplied by the residual heating amount in the film thickness value obtaining step S32 before curing step S40 to obtain the film thickness after curing, but the film thickness value before curing may be measured by a wet film thickness gauge only before curing, and the film thickness after curing may be calculated in the evaluation step S50.
(C3) In the uniform coating step S31 of each of the above embodiments, the coating is started from the first black-and-white masking test member 11 having a small target film thickness value, but the coating may be started from a member having a large target film thickness value. The coating routes R1, R2, and R3 may be changed as appropriate as long as the black-and-white masking test members 11, 12, 13, 14, and 15 to be coated can be coated to a uniform thickness.
(C4) In the exclusion step S33 of each of the above embodiments, the black-and-white masking test pieces 11, 12, 13, 14, and 15 to be excluded are removed from the substrate 23, but may be continuously assembled to the substrate 23, for example, as long as the objects to be painted in the next uniform painting step S31 can be excluded. In this case, the coating can be performed by disposing a shielding plate at a boundary (for example, between the first black-and-white mask experiment unit 11 and the second black-and-white mask experiment unit 12) between the black-and-white mask experiment unit (for example, the first black-and-white mask experiment unit 11) whose film thickness has reached the target film thickness value and the black-and-white mask experiment unit (for example, the second to fifth black-and-white mask experiment units 12, 13, 14, 15) which has not reached the target film thickness value, so that dust of the coating does not adhere to the black-and-white mask experiment unit whose film thickness has reached the target film thickness value.
(C5) In the second embodiment, the film thicknesses of all the black-and-white masking test members 11, 12, 13, 14, and 15 were measured by an electromagnetic film thickness meter before the evaluation step S50, but only the post-curing film thicknesses of the corresponding black-and-white masking test member extracted in the evaluation step S50 (the third black-and-white masking test member 13 in the example of the second embodiment) may be measured.
(C6) In the above embodiments, the value of the target film thickness is set based on the film thickness after curing, but may be set based on the film thickness before curing.
(C7) In the step coating process of each of the above embodiments, the coating may be performed by a manual spray gun, or may be performed by a robot or a die coater.
The present disclosure is not limited to the above embodiments, and can be implemented in various configurations without departing from the scope of the present disclosure. For example, technical features in the embodiments corresponding to technical features in the respective aspects described in the summary of the invention may be appropriately replaced or combined to solve a part or all of the problems or achieve a part or all of the effects. In addition, if technical features thereof are not described as essential in the present specification, they may be deleted as appropriate.
Description of the reference numerals
11 … black-and-white masking experiment component, 12 … second black-and-white masking experiment component, 13 … third black-and-white masking experiment component, 14 … fourth black-and-white masking experiment component, 15 … fifth black-and-white masking experiment component, 16 … tin plate, 17 … black-and-white masking experiment paper, 18 … white block part, 19 … black block part, 21 … upper empty space, 22 … lower empty space, 23 … substrate, R1, R2 and R3 … coating route, S10 … film thickness determination process, S20 … configuration process, S30 … step coating process, S31 … uniform process, S32 and S320 … film thickness value acquisition process, S33 … process excluding coating process, S40 … curing process and S50 … evaluation process.
Claims (5)
1. A method for testing the hiding performance of a paint, which uses a plurality of black-and-white hiding test members having black-and-white patterns, the method comprising:
a step coating step of applying the paint by changing the number of times of coating so that the target film thickness values are different in a stepwise manner for each of the plurality of black-and-white masking test members to which the paint is not applied;
a curing step of curing the paint applied to the plurality of black-and-white masking test members; and
and an evaluation step of evaluating the black-and-white hiding property of the paint by comparing the plurality of black-and-white hiding test members obtained through the curing step with each other.
2. The hiding test method of paint according to claim 1,
the step coating process comprises the following steps:
a uniform coating step of coating the black-and-white masking test member, which is one of the plurality of black-and-white masking test members before the curing step and has a thickness of the paint that does not reach a value corresponding to the target film thickness value before the curing step, with a uniform thickness; and
an exclusion step of excluding the black-and-white masking test member, of which the pre-curing film thickness value has reached a value corresponding to the target film thickness value, from the objects of the next uniform coating step,
the uniform coating step and the eliminating step are repeated until the pre-curing film thickness value of all the black-and-white mask test members other than the black-and-white mask test member excluded from the target in the eliminating step reaches a value corresponding to the target film thickness value.
3. The method for testing the hiding property of a paint according to claim 1 or 2,
the evaluation step includes:
comparing two black-and-white masking test members of the plurality of black-and-white masking test members after the curing step is performed, the two black-and-white masking test members having the target film thickness values of adjacent steps, and determining a black-and-white masking test member in which a boundary between a white portion and a black portion in the black-and-white pattern is not observed;
a film thickness value acquiring step of acquiring a cured film thickness value, which is the thickness of the paint in the black-and-white masking test member having the determined critical value; and
and determining the obtained cured film thickness value as a black-and-white hiding film thickness value which is an evaluation value of the black-and-white hiding property.
4. The hiding test method of paint according to claim 3,
the step coating process comprises the following steps:
a uniform coating step of coating the black-and-white masking test member, which is one of the plurality of black-and-white masking test members before the curing step and has a thickness of the paint that does not reach a value corresponding to the target film thickness value before the curing step, with a uniform thickness;
a film thickness measuring step of measuring the pre-curing film thickness value in the black-and-white masking test member after the uniform coating step is performed; and
an excluding step of comparing the measured pre-curing film thickness value with a value corresponding to the target film thickness value, and excluding the black-and-white masking test member, of which the pre-curing film thickness value has reached the value corresponding to the target film thickness value, from the objects of the next uniform coating step,
repeating the uniform coating step, the film thickness measuring step, and the eliminating step until the pre-curing film thickness values of all the black-and-white mask test members other than the black-and-white mask test member excluded from the target in the eliminating step reach values corresponding to the target film thickness values,
the film thickness value acquisition step includes the steps of: the post-curing film thickness value is calculated by multiplying the pre-curing film thickness value measured in the film thickness measuring step by the residual heating amount determined in advance through experiments, which is the ratio of the solid content remaining as a coating film after baking the coating material.
5. The hiding test method of a paint according to any one of claims 1 to 4,
the target film thickness values were stepwise different at equal intervals in each of the black-and-white shading test units.
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| JP2020-212358 | 2020-12-22 | ||
| JP2020212358A JP7528775B2 (en) | 2020-12-22 | 2020-12-22 | Test method for the hiding power of paint |
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| US (1) | US20220196562A1 (en) |
| JP (1) | JP7528775B2 (en) |
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Also Published As
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| US20220196562A1 (en) | 2022-06-23 |
| JP2022098774A (en) | 2022-07-04 |
| JP7528775B2 (en) | 2024-08-06 |
| WO2023086186A1 (en) | 2023-05-19 |
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